Air pump



FIG. 1 is a top perspective view of an air pump showing my new design;

FIG. 2 is a front elevational view of thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another top perspective view thereof.

The broken lines in the drawings depict portions of the air pump that form no part of the claimed design. 

CLAIM The ornamental design for an air pump, as shown and described. 